Streamline chunking logic - allow unique or non-unique chunking

[huangh]

Set it back to default to uniqueing for now - not sure if there's a need to do non-unique output at the moment. Can re-evaluate if the analysis need arises again.

[github-actions]

LCOV of commit da4f9f0 during Continuous Integration (Python) #2058

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  src/lamp_py/ingestion/convert_gtfs_rt.py                                           |88.8%    242|50.0%    26|    -      0
  src/lamp_py/ingestion/convert_gtfs_rt_fullset.py                                   |51.3%    117|18.8%    16|    -      0

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LCOV of commit b2b8cd5 during Continuous Integration (Python) #2059

Summary coverage rate:
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  src/lamp_py/ingestion/convert_gtfs_rt.py                                           |88.8%    242|50.0%    26|    -      0
  src/lamp_py/ingestion/convert_gtfs_rt_fullset.py                                   |51.3%    117|18.8%    16|    -      0

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LCOV of commit a5679f4 during Continuous Integration (Python) #2060

Summary coverage rate:
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  src/lamp_py/ingestion/convert_gtfs_rt.py                                           |88.8%    242|50.0%    26|    -      0
  src/lamp_py/ingestion/convert_gtfs_rt_fullset.py                                   |51.3%    117|18.8%    16|    -      0

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LCOV of commit 566b326 during Continuous Integration (Python) #2061

Summary coverage rate:
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  src/lamp_py/ingestion/convert_gtfs_rt.py                                           |88.8%    242|50.0%    26|    -      0
  src/lamp_py/ingestion/convert_gtfs_rt_fullset.py                                   |51.3%    117|18.8%    16|    -      0

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LCOV of commit b075baa during Continuous Integration (Python) #2065

Summary coverage rate:
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  src/lamp_py/ingestion/convert_gtfs_rt.py                                           |88.8%    242|50.0%    26|    -      0
  src/lamp_py/ingestion/convert_gtfs_rt_fullset.py                                   |51.3%    117|18.8%    16|    -      0